I keep meaning to buy a DVR kit so I can record my rides/blog while riding, but aside from the fact a decent kit is around £250, it's just asking to get pulled over. Bearing in mind I have a bright orange bike you can hear from a mile away, and I don't exactly hang around, combined with the fact if I was to get pulled over, I have an aversion to authority so argue back (normally correctly in the eyes of legality and common sense but you know what these police people are like) so I'd rather not draw unneccesary attention to myself.